Pneumatic tool.



PATENTEDDEG. 15, 1903.

No. massa w. H'. soLEY. PNEUMATIG Tool..

40ML-,- HLM I v ATTORNEY;

UNITED STATESA Patented December l5, 1903.

PATENT OEE-ICE:

WILLIAM H. SOLEY, OF `PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY

MESNE ASSIGNMENTS, OF ONE-HALF TO THOMAS H. DALLETT OOM- PANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

PNEUMATIC TOOL.

SPECIFICATION forming part of Letters Patent No. 747,336, dated December 15, 1903.

Application led August 1, 1902. Serial No. 117,954. (No model.)

chamber to shift the valve to admit air to the top of the piston-chamber by the piston itself in its upwardmovemeut, and thus can adjust the point of this change so as -to give the desired length of stroke to the piston. The specific mechanism and arrangement of parts by which I accomplish this will be more apparent by reference to the accompanying drawings, which illustrate an embodiment of my invention. Y

As the general details of construction of a pneumatic tool are well known, I have deemed it necessary in the drawings to show only so much thereof as is necessary to illustrate my invention.

vIn the drawings, Figure lis a section of the upper position of pneumatic tool with piston below auxiliary valve. Fig. 2 is a similar section with piston in position after having acted upon auxiliary valve. Eig. 3 isa detail sectional view of the auxiliary valve controlled by piston.

A is the piston-chamber; A', the piston in said chamber; B, the valve-chamber, and B the valve, having the shouldersd d', air being admitted above the shoulder d to force the valve downward to admit air to the bottom of the piston-chamber and acting below the shoulder d' to force the valve upward to admit air to the top of the piston-chamber. As the details, ports, and passages for accomplishing the admission of air to the bottom and top of the piston-cham ber when the valve is in the two positions are well known and may be varied and form no part of my invention,

l they are not shown. The two positions of the valve are shown in Figs. l and 2, respectively. What forms my invention is the mechanism by which I accomplish the shift of the valve from the position shown in Fig. l to that shown in Fig. 2, and is as follows.

A C is a passage in constant connection with the main air-supply passage D.

E is a lateral passage in the walls of the piston chamber opening into the piston-chamber and into the passage C.

F is a vertical passage terminating at one end in the passage E and at the other end in the port G, opening into the valve-chamber below the shoulder CZ. The passage E is contracted at its point of entry into the piston-chamber, forming the internal shoulder e.. In this passage E is an auxiliary valve having at one end the cylindrical portion h, substantially the size of the passage E. Beyond this is the circumferentially-grooved portion QI, having the orificesgextending through the valve and terminating in the lateral passage k,- open at one end. Beyond the grooved portion t' is the flange l, and beyond that the spherical head lm. The ange Z, contacting with the shoulder e, limits the movement in one direction of the auxiliary valve. When the auxiliary valve is in the position shown in Fig. 1, the passage E is closed by the cylindricall portion h of the auxiliary valve and no live air passes to the lower portion of the valve-chamber. The live-air pressure constantly passing through passage C and through passage k holds the auxiliary valve in the position shown in Fig. l. When, however, the auxiliary valve is shifted into the position shown in Fig. 2, the orifices j are opposite the passage F and the live ail' passes into and up said passage and into the valve-chamber through port G, shifting the main valve B. This shift of the auxiliary valve is accomplished in the following manner.

The upper surface of the piston is slightly rounded o, as shown at 0, and when in the upward movement of the piston it reaches head of such auxiliary valve, moving it laterally into the position shown in Fig. 2. The

the auxiliary valve it strikes .the spherical' auxiliary valve remains in this position until the piston descends below said auxiliary valve,\vhen the air-pressure behind said valve will again bring it to the position shown in Fig. l. By this construction I am enabled by adjusting the position of the passage E and its appurtenances to have any length of stroke of piston desired.

Having now fully described my invention, what I claim, and desire to protect by Letters Patent, is-

1. In a pneumatic tool, in combination,with the piston-chamber and piston therein and valve-chamber and valve therein, of a lateral passage opening into the piston-chamber at the upper portion thereof, a passage connected with. the air-supply and a passage from the valve-chamber opening into said lateral passage, an auxiliary valve in said lateral passage, said auxiliary valve having a passage in constant communication with the live air, circumferential-grooved-portion oriices in said portion extending into said passage and a projecting portion adapted to extend Within the piston-chamber, said auxiliary valve being moved in one direction by the live air and in the other direction by the piston in its movement.

2. In a pneumatic tool, in combination with the piston-chamber and piston therein and valve-chamber and valve therein, of a passage leading from the source of air-supply, a passage leading to the valve-chamber,a transverse passage connecting said last-mentioned passages, an auxiliary valve in the transverse passage, having a passage in constant communication with the source of pressuresupply, and openings through the valve adapted in the movement of the valve to register with the valve-chamber passage.

In testimony of which invention I have hereunto set my hand at Philadelphia, on this 18th day of July, 1902.

WILLIAM H. SOLEY.

Witnesses:

M. F. ELLIS, G. I. HUTToN. 

